A review of the weekend's action in the Dutch Eredivisie.
Ajax cashed in on PSV Eindhoven's stutter on Saturday to take a one-point lead in the Eredivisie standings.
PSV were surprisingly beaten by Heerenveen, but Ajax made no such mistake as they brushed aside PEC Zwolle 3-0 at the Amsterdam ArenA.
Kolbeinn Sigthorsson and Siem de Jong put the hosts two up inside 26 minutes before Derk Boerrigter added the gloss late on.
Feyenoord and Vitesse Arnhem, the sides in third and fourth, both celebrated 1-0 away wins.
Graziano Pelle's goal on the half-hour saw off Roda JC for Feyenoord, while Wilfried Bony netted in the 63rd-minute as Vitesse edged out FC Twente.
Utrecht also secured a 1-0 success, Jacob Mulenga notching 12 minutes from time to down visiting RKC Waalwijk.
On Saturday, Marten de Roon and Yassine El Ghanassy were both on target for Heerenveen in the 2-1 win over PSV.
Kevin Strootman mustered PSV's only response 16 minutes from time.
At the other end of the table, basement boys Willem II managed just their third win of the season at home to second-bottom VVV-Venlo.
Danny Gujit scored the only goal in the 89th minute.
Ten-man Heracles Almelo also won by a 1-0 scoreline, Everton netting in the 58th minute to sink NEC Nijmegen.
The hosts held on for the final 23 minutes a man down following Thomas Bruns' red card.
Viktor Elm's 25th-minute equaliser earned struggling AZ Alkmaar a 1-1 home draw against ADO Den Haag, who had taken a 10th-minute lead through Mike van Duinen.
On Friday night, FC Groningen had to settle for a 1-1 draw from their clash with mid-table rivals NAC Breda.
The match briefly tilted Groningen's way when they seized a 48th-minute lead thanks to Maikel Kieftenbeld, who crashed a fierce shot into the top left corner from 25 yards after a corner was only half cleared.
However NAC were back on level terms two minutes later after they were awarded a penalty for a shove in the box, and Jordy Buijs converted from the spot.